CN1035342A - A kind of scavenging method of four-stroke boost diesel engine - Google Patents
A kind of scavenging method of four-stroke boost diesel engine Download PDFInfo
- Publication number
- CN1035342A CN1035342A CN88103186A CN88103186A CN1035342A CN 1035342 A CN1035342 A CN 1035342A CN 88103186 A CN88103186 A CN 88103186A CN 88103186 A CN88103186 A CN 88103186A CN 1035342 A CN1035342 A CN 1035342A
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- Prior art keywords
- diesel engine
- scavenging method
- stroke
- valve
- scavenging
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/027—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle four
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
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- Output Control And Ontrol Of Special Type Engine (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a kind of new scavenging method of supercharged diesel engine.The realization of this method is by a double peak cam, and to compression stroke initial stage scope, order has been finished the outlet valve of exhaust and opened once more in aspirating stroke, and the valve hole that allows of piston head can remove or keep equally shallow with non pressurized machine from.
Description
The present invention relates to supercharged diesel engine scavenging method.
To four-stroke boost diesel engine, in order to reduce the high temperature part heat load, reduce residual gas, improve cylinder charge, all like to adopt intake ﹠ exhaust valves to open the way of one period long period simultaneously and make blow down.As China's 4146 diesel engines, at rotating speed is under 1000 rev/mins of conditions during turbosupercharging, air inlet and normal exhaust overlapping angle are 130 crank angles, if exhaust this moment is a 580C increase degree be 126.34% this overlapping angle less than 40 then delivery temperature is 605C, supercharging level only is 125%.
The turbo-charged diesel that scavenging is arranged, mechanical efficiency increases after the supercharging, excess air coefficient also has raising slightly, fuel consumption rate also should descend, but in, find in the supercharged diesel engine of the dark firing chamber of small-power, because the semi-open type firing chamber has been destroyed in the valve hole of allowing of scavenging, lead that the fuel consumption rate of diesel engine is not less than non pressurized machine after the system turbosupercharging." improving diesel engine power and the approach that improves its Economy " book, (Chinese first Ministry of Machine-Building Industry's Internal Combustion Engine institute) research are pointed out, when piston head adopts the semi-open type firing chamber, allow the valve hole that the formation of mixed gas is deteriorated significantly on the piston head, cause fuel consumption rate to increase, research also points out, allow valve hole make the propellant flow rate of semi-open type firing chamber diesel engine increase the 4-8 gram/horsepower-hour.This book is pointed out simultaneously, when having open combustion chamber on the piston head, makes the valve hole very unobvious to the deterioration of fuel consumption rate.But in, light duty diesel engine mostly is the semi-open type firing chamber, in the firing chamber, allows the valve hole make to squeeze stream or intake swirl has suffered destruction in various degree, causes oil consumption to increase.For the divided combustion chamber diesel engine, allow the valve hole can destroy the forming process of mixer equally.
The invention provides a kind of new scavenging method, in aspirating stroke and in the initial stage scope of compression stroke, order has been finished the outlet valve of exhaust and has been opened once more, and the duration of its unlatching is 60 °-150 ° by crank angle tolerance.Optimum value is determined by experiment or calculates definite by method of characteristics circulating analog program.This method for exhausting is realized by bimodal exhaust cam, has both increased an auxiliary exhaust cam on the normal exhaust cam.The molded lines of normal exhaust cam and auxiliary exhaust cam can be adjacent, also can non-conterminous connecing and certain angle θ=0 °-70 ° of being separated by.After adopting this scavenging method, because piston head does not have the valve of allowing hole or make the valve hole equally shallow with non pressurized machine, can not destroy the firing chamber, so fuel consumption rate will more commonly there be near the gas exchange process upper dead center supercharged diesel engine at bigger air inlet and normal exhaust overlapping angle low; Because bigger air inlet and auxiliary exhaust overlapping angle are arranged, the supercharged diesel engine of the delivery temperature of exhaust manifold or more not scavenging of turbine inlet gas temperature is low; Should be maintained to the beginning at compression stroke initial stage for the lasting angle of the pulse turbocharging diesel engine auxiliary exhaust of an outlet pipe of three cylinders and close, at this moment the firing pressure in the cylinder also is lower than common supercharged diesel engine.
Fig. 1 is double peak cam figure.θ 1 is a normal exhaust cam crank angle of rotation, and θ 2 is an auxiliary exhaust cam crank angle of swing, and θ is the adjacent angle between normal exhaust cam and the auxiliary exhaust cam.
Fig. 2 is the pressurization system figure of four cylinder four-stroke pulse radial-flow turbine supercharged diesel engine.1 is first cylinder, and 2 is second cylinder, and 3 is the 3rd cylinder, and 4 is the 4th cylinder, and T is a turbine, and C is a gas compressor.
Fig. 3 is a speed characteristic curve.Horizontal ordinate is a rotating speed, and ordinate is a turbine-exit temperature.
Fig. 4 is a load characteristic curve.Horizontal ordinate is a power, and ordinate is a turbine-exit temperature.
This scavenging method has been made comparative trial on four cylinder pulse turbocharging diesel engine 495Z.This machine pressurization system as shown in Figure 2, ignition order is 1-3-4-2.The double peak cam angle is respectively θ=0 °, and it is identical that θ 1 and normal exhaust do not have the scavenging cam, θ 2=60 °.This Shi Yan is Yu the former scheme of No scavenging exhaust cam compares test, and other structural parameter are consistent in two kinds of schemes.The performance characteristic of test result is shown in Fig. 3 and Fig. 4.These characteristic curves point out that new departure turbine-exit temperature can reduce by 50 ℃-65 ℃.Meet design performance prediction conclusion.Be that this scavenging method can reduce delivery temperature more than 40 ℃.
A kind of scavenging method of four-stroke boost diesel engine
The 1st, 2 pages of erratas of specification
Claims (2)
1, a kind of four-stroke boost diesel engine inlet and discharge valve scavenging method of opening simultaneously is characterized by the exhaust steam valve of having finished steam discharge in aspirating stroke order to the compression stroke initial stage scope and opens once more; And the valve hole that allows of piston head can remove or keep equally shallow with non pressurized machine from.
2, scavenging method according to claim 1, the duration of unlatching once more that it is characterized by exhaust steam valve is 60 °-150 ° by crank angle tolerance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88103186A CN1010333B (en) | 1988-05-25 | 1988-05-25 | Scavenging method for four-stroke boost diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN88103186A CN1010333B (en) | 1988-05-25 | 1988-05-25 | Scavenging method for four-stroke boost diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035342A true CN1035342A (en) | 1989-09-06 |
| CN1010333B CN1010333B (en) | 1990-11-07 |
Family
ID=4832487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88103186A Expired CN1010333B (en) | 1988-05-25 | 1988-05-25 | Scavenging method for four-stroke boost diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1010333B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588104A (en) * | 2012-01-13 | 2012-07-18 | 杨世铜 | Cam type internal-combustion engine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011735B (en) * | 2009-12-25 | 2012-08-22 | 无锡压缩机股份有限公司 | Exhaust structure of asymmetric rotor profile screw compressor and design method thereof |
-
1988
- 1988-05-25 CN CN88103186A patent/CN1010333B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588104A (en) * | 2012-01-13 | 2012-07-18 | 杨世铜 | Cam type internal-combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1010333B (en) | 1990-11-07 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |